The aim of the study is to compare the efficacy of two doses of a fixed combination of ciclesonide/formoterol fumarate versus ciclesonide alone versus formoterol fumarate alone in patients with asthma. The study duration consists of a baseline period (2 to 3 weeks) and a treatment period (8 weeks). The study will provide further data on safety and tolerability of ciclesonide/formoterol fumarate.